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14
STRATUS TA20 Series Industrial Air Conditioners User Manual
1st Edition RevA.
Maximum and Minimum Temperature
1. Press and release the DOWN arrow key.
The Lo message will be displayed followed by the minimum temperature recorded.
2. By pressing the DOWN arrow key again or waiting 5 seconds, the normal display will be restored.
1. Press and release the UP arrow key.
The Hi message will be displayed followed by the maximum temperature recorded.
2. By pressing the UP arrow key again or waiting 5 seconds, the normal display will be restored.
1. Press and hold the SET key for more than 3 seconds, while the maximum or minimum temperature is displayed. (rSt message will be displayed)
2. To confirm the operation, the rSt message will blink and the normal temperature will be displayed.
Alarm Signals
Message Cause Outputs
P1
Enclosure probe failure Alarm relay operates; start and stop of the compressor after 15-minute intervals
P2
Condenser probe failure Alarm relay operates
HA
Maximum temperature alarm: P1 L 105°F for 3 minutes (after initial 30 min. delay)
Alarm relay operates
LA
Minimum temperature alarm: P1 l 45°F for 3 minutes (after initial 30 min. delay)
Alarm relay operates
HA2
Condenser high temperature: P2 L 145°F for 3 minutes
Alarm relay operates, compressor off
LA2
Condenser low temperature: P2 l 50°F for 3 minutes
Alarm relay operates
CA
Evaporator coil alarm: low pressure for 2 minutes
Alarm relay operates, compressor off
noP
Invalid probe selected: low evaporator coil No outputs, display only
If the compressor is turned off due to an alarm, it will be able to restart after the AC anti short-cycle time delay. (Parameter AC = 5 minutes)
Probe alarm P1 is cleared with no time delay after the fault is cleared.
Probe alarm P2 starts and stops with no time delay.
Temperature alarm HA automatically clears as soon as the temperature returns to below 105°F (the ALU setpoint) - 2°F = 103°F.
Temperature alarm LA automatically clears as soon as the temperature returns to above 45°F (the ALL setpoint) + 2°F.
Temperature alarm HA2 automatically clears as soon as the condenser coil temperature returns to below 135°F.
Temperature alarm LA2 automatically clears as soon as the condenser coil temperature returns to above 60°F
Temperature alarm CA automatically clears as soon as the pressure returns to normal.
ALARM RECOVERY
ALARM SIGNALS
HOW TO SEE THE MINIMUM TEMPERATURE
HOW TO SEE THE MAXIMUM TEMPERATURE
HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
Functions and Parameters
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